Wire Brushing Masonry for Repainting

10 Jan 2013
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United Kingdom
I have read somewhere that you should not use a wire brush on masonry before repainting.

However, the paint I had put on 2 years ago is coming off in sheets.

My coats, Sandtex, were on some sort of Masonry paint , both coats are coming off together.

Under them both , which has not come off, is a finish that looks almost like gloss paint and adhering well.

Should I use a wire brush on this 'gloss' to give a 'key' when I repaint with Sandtex ?
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